Nets work best to catch fish while they are going nowhere.
A fish on the move is hard to catch with a net, but a fish just hanging out is easily scooped up. It’s even easier to catch a fish hanging out in a school of comfortable fish not going anywhere together.
No one of the strands of the net could trap a fish by itself, but when they all weave together, it seems impossible to escape. If one string doesn’t have a fin, the other does.
Bait is unneeded at this point, unless you happen to be amused by watching them struggle. They are caught. They can set their goal on something beyond their current situation and try get somewhere, but they aren’t able to make it happen. The net needs out of the way first.
But, in spite of the overwhelming net of so many strands trapping them, all it really takes for escape is one or two strands. Just a tiny fraction, enough to wiggle, enough to make all the strings which seemed so tightly bound completely unravel.
But a moving fish… that’s a different story. Nets are harder to use with a fish that’s going someplace.
A moving fish needs bait. It needs a temptation to entice it to hook itself on a line and trap itself for you.
Of course, fish don’t all like the same baits. The worm that looks enticing to one is easily passed up by another. You have to know the fish you are looking for… know the type and what’s going to be the most irresistible, to be the biggest temptation.
Where a still fish require many strings to restrict its movement towards its goal, the active fish requires only one to pull it somewhere it doesn’t want to go and away from where it wants to be.
But the method of escape remains the same for both fish.
Break a line, or two, and swim for your life.